Means for withdrawing steam from steam-engines.



C. A. HARTUNG.

MEANS FOR WITHDBAWING STEAM FROM STEAM ENGINES.

APPLICATION FlLED MAY 14. 1912. 1,155,811. Patented 001.51915.

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CARL AnoLF HARTUNG, or iEnLIN, GERMANY.

MEANS FOR WITHDRAWING STEAM FROM STEAM-ENGINES.

Specification of Letters Patent.

rateatea oet. 5, 1915.

origami appncation inea March 2s, 1911, serai no. 617,356. Divided andthis application ined May 14, 1912.- seriai no. 697.2%.

To aZZ whom t may concern:

Be it known that I, CARL ADOLF HARTUNG, a subject of the King ofPrussia, and residing at Berlin, Germany, have invented a certain newand useful Means for Vithdrawing Steam from Steam- Engines, of which thefollowing is a specification.

The invention relates to steam enginesyin which the heating steam iswithdrawn from the engine cylinder when the piston moves backward, thesteam having been compressed by the piston to such an extent that itspressure exceeds by a small amount that in the pipe leading to theheating devices or radiators.

The invention consists in the provision of special withdrawal valves forthe steam for heating purposes, independent of the usual admission andexhaust valves, which withdrawal valves are normally held closed by aspring or its equivalent and are locked by a special valve gearduringthe working stroke of the piston. These valves are released duringthe return stroke of the piston, and open when the pressure in thecylinder becomes a little greater than it is in the heating apparatus.

The present application is a division of my copending application SerialNo. 617,356, filed March 28, 1911.

vThe various features of the invention will be readily understood froman inspection of the accompanying drawings.

Figure 1 is a diagrammatic section showing my device connected with asingle stage steam engine; and Fig. 2 is a section through a particularform of withdrawal valve and its locking device.

Referring to Fig. 1 the cylinder of a single stage ordinary engine has apiston i, and the usual admission valves a, a, at the top of thecylinder' ends and exhaust valves Z), Z), arranged correspondinglybelow. Live steam is supplied through the admission pipe 8 to theadmission valves a, a. For withdrawing steam for heating purposes Irovide special withdrawal valves c, c, from which the steam passesthrough the pipe 11 into the heating pipe. These withdrawal valves c, care constantly seated by the pressure of the steam for heating purposesand. if necessary, by an additional force, e. g., a spring n and arepositively closed by valve gear Z shortly before the admission valvesbegin to open and are kept closed by this gear during the expansion ofthe live steam in the cylinder. The pipe CZ leads from the exhaust`valves ZJ to the condenser or other exhaust. In'this pipe is arranged aclosure valve e diagrammatically represented as a throttle valve. Therod f connects this valve with a controller, the cylinder g of which isconnected by the pipe Z1, with the heating system 37. The piston is thussub- ]ect to the pressure in the heatingv system '37. When thesteam'pressure in the pipe h rises it pushes the piston 9 forwardagainst the action of the spring 10 and opens the valve e in theexhaust. v

The cycle of operations takes place as follows z-When an inlet valve a'opens shortly before the termination of the return strokel of thepiston, the withdrawal valve 0, lo-

cated at the same end is closed by the valve gear Z, while'thewithdrawal valve c, located at the other end is released at the samemoment, but is still kept seated by the excessl pressure from theheating apparatus. The exhaust valves o are already open, and accordingto the pressure for the time being in the heating apparatus the valve ehas allowed a larger or smaller part of the operative steam to escape tothe exhaust.

After the direction of movement of the pis.

ton has been reversed and the valves Z) are closed, the residue of steamis first compressed so that the pressure which is produced opens thewithdrawal valve c and the steampissues through the same until the valvegear closes' the withdrawal valve c, shortly before the termination ofthe stroke. Then further compression takes place.

The withdrawal valves and closure members may be formed as desired.Fig.'2 shows an illustrative form of the withdrawal valve in section.The head m of the cylinder 7c has formed therein the port 0 for the diskvalve p which is pressed to the seat g, by the spring n and by the headof steam in the heating system 37. The disk valve p is provided with arelieving piston o" slidable in the cylinder s and fast on the rod to.The space or chamber t behind the piston 7' com municates through thebore a of the rod w, with the cylinder lc. The steam for heatingpurposes passes out at fu when the valve opens. The rod w is guided inthe bearing w. Now when the steam presses against the valve disk p itsimultaneously acts by way of the bore u in the opposite directionagainst the relieving piston r. As the diameter' of the valve disk 79 islarger than thatof the piston fr, the valve 2) with the piston 1', willslide to the left in the bearing m until the mouth u of the bore uenters into the bearing and is thus closed. The steam shut oli' behindthe relieving piston o then acts as a cushion. The disk p and piston rare moved back by the steam pressure oi" the heating pipe which, whenthe same is higher than the pressure in the cylinder, acts through theport o against the back or' the disk p and closes the valve. The valveis closed and locked toward the end orp the stroke of the piston by theslide G which is moved and controlled by suitable gearing directly orindirectly by means of the rod 7. rlhe slide 6 carries an antifrictionroller 5 lying against the curved tace 4 of a block 3, attached by meansof studs 2 on the piston l guided in the casing a. Between the rod 1Uand the projection g/ of the piston l is interposed the spring n whichabuts against a shoulder on the rod 10. Then the slide 6 is pushedupward the roller 5 runs up the curved face 4 and presses the block 3and with it the valve disk y) into the closed position. rlhe spring a isof a strength sutlicient to maintain the valve 72 seated under allpressures normally occurring in the cylinder It. lt permits the valve toopen however when the normal maximum pressure is exceeded and thusoperates as a safety valve, although the valve as a whole may be held inclosed position by the slide 6.

l claim as my invention l. A device for withdrawing steam for heatingpurposes from steam cylinders, comprising in combination, a withdrawalvalve in communication with the steam cylinder, a hollow spindletherefor, a. relieving piston on the latter to which steam from thecylinder has access through the hollow spindle, a closure member forclosing the bore in the spindle controlled by the movement of thespindle, and a device by which the withdrawal valve is held closedduring the working stroke of the piston.

2. A device for withdrawing steam for heating purposes from steamcylinders, comprising in combination, a withdrawal valve incommunication with the steam cylinder, a hollow spindle therefor, arelieving piston fast on the latter to which the steam from the cylinderhas access through the hollow spindle, a closure member for the bore ofthe spindle controlled by the motion or' the spindle, a positivelyactuated slide, a roller journaled on the slide, and a plungeroperatively connected to the said slide having a cam face over whichsaid roller runs on the displacement of the slide to close thewithdrawal valve.

3. A device for withdrawing steam from steam cylinders, comprising incombination, a withdrawal valve in communication with the steamcylinder, a hollow spindle therefor, a relieving piston fast on saidspindle and subjected to the pressure of the steam cylinder through saidhollow spindle, a closure member for the bore of the spindle controlledby the motion of the spindle, a positively controlled slide for holdingthe valve to its seat under normal pressure conditions, a rollerjournaled on the slide, a plunger with cam bearing face for said rolleradapted to be displaced by the latter during the travel of the slide anda spring interposed between the plunger and the valve spindle.

In testimony whereof I have signed my name to this specification, in thepresence ot two subscribing witnesses.

CARL ADOLF HARTUNG.

Witnesses:

HENRY HAsrnR, RICHARD Gonrz.

Copies of this patent may be obtained. for five cents each, byaddressing the Commissioner of Patents. Washington, D. C.

